2D numerical modeling on meander chute cutoffs

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Reproduction of river meander cutoffs in laboratory has been found to be a challenging endeavor. In particular, stream bank failure is difficult to reproduce at small laboratory scales. Even though it may be much simpler to balance bank erosion and bank accretion with the help of numerical models, the difficulties to numerically model cutoffs remain. Existing numerical models for meander migration frequently tend to treat cutoffs as a fleet process. In this study, two distinctive but inter-related methods to model cutoffs are discussed. Both methods solve the 2D depth-averaged, unsteady Reynolds-averaged Navier–Stokes equations (URANS) coupled with k-ε model for turbulence closure. The Meyer-Peter Müller formula with the Exner equation are solved for bedload transport and bed morphology evolution. In the first method, the cutoff starts to develop through a process that periodically widens the chute cutoff channel. After each widening event, an originally non-erodible portion of floodplain collapses and becomes erodible. The coupling period of the widening process is subject to calibration. In the second method, the widening process is simulated with a hybrid deterministic-stochastic bank failure model. The widening process in this method is governed by the near bank sheer stress and the bank critical shear stress. The method assumes Gaussian distributions of both near bank shear stress and critical bank shear stress to evaluate the bank failure risk. Both methods are tested using a simplified bench scale chute cutoff, which is scaled down from a natural chute cutoff in the Wabash River, between Illinois and Indiana, USA.

Original languageEnglish (US)
Title of host publicationRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics
EditorsWim Uijttewaal, Mario J. Franca, Daniel Valero, Victor Chavarrias, Claudia Ylla Arbos, Ralph Schielen, Ralph Schielen, Alessandra Crosato
PublisherCRC Press/Balkema
Number of pages6
ISBN (Electronic)9780367627737
StatePublished - 2020
Event10th Conference on Fluvial Hydraulics, River Flow 2020 - Virtual, Online, Netherlands
Duration: Jul 7 2020Jul 10 2020

Publication series

NameRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics


Conference10th Conference on Fluvial Hydraulics, River Flow 2020
CityVirtual, Online

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Geotechnical Engineering and Engineering Geology


Dive into the research topics of '2D numerical modeling on meander chute cutoffs'. Together they form a unique fingerprint.

Cite this